i2ptunnel: Fixes and cleanups for command line testing;

catch IAE from getInstance() if i2ptunnel.config isn't found
in app context; log tweaks; config command tweaks
Unit tests: Fix several NPEs in LocalClientManager,
implement HostLookup

router/java/src/net/i2p/router/client/ClientConnectionRunner.java

@@ -165,7 +165,9 @@ class ClientConnectionRunner {
      */
     public synchronized void stopRunning() {
         if (_dead) return;
-        if (_context.router().isAlive() && _log.shouldLog(Log.WARN)) 
+        // router may be null in unit tests
+        if ((_context.router() == null || _context.router().isAlive()) &&
+            _log.shouldWarn()) 
             _log.warn("Stop the I2CP connection!  current leaseSet: " 
                       + _currentLeaseSet, new Exception("Stop client connection"));
         _dead = true;

router/java/src/net/i2p/router/client/ClientListenerRunner.java

@@ -15,6 +15,7 @@ import java.net.ServerSocket;
 import java.net.Socket;
 
 import net.i2p.client.I2PClient;
+import net.i2p.router.Router;
 import net.i2p.router.RouterContext;
 import net.i2p.util.Log;
 
@@ -101,17 +102,17 @@ class ClientListenerRunner implements Runnable {
                             } catch (IOException ioe) {}
                         }
                     } catch (IOException ioe) {
-                        if (_context.router().isAlive()) 
+                        if (isAlive()) 
                             _log.error("Server error accepting", ioe);
                     } catch (Throwable t) {
-                        if (_context.router().isAlive()) 
+                        if (isAlive()) 
                             _log.error("Fatal error running client listener - killing the thread!", t);
                         _listening = false;
                         return;
                     }
                 }
             } catch (IOException ioe) {
-                if (_context.router().isAlive()) 
+                if (isAlive()) 
                     _log.error("Error listening on port " + _port, ioe);
             }
             
@@ -121,7 +122,7 @@ class ClientListenerRunner implements Runnable {
                 _socket = null; 
             }
             
-            if (!_context.router().isAlive()) break;
+            if (!isAlive()) break;
             
             if (curDelay < 60*1000)
                 _log.error("Error listening, waiting " + (curDelay/1000) + "s before we try again");
@@ -131,11 +132,20 @@ class ClientListenerRunner implements Runnable {
             curDelay = Math.min(curDelay*3, 60*1000);
         }
 
-        if (_context.router().isAlive())
+        if (isAlive())
             _log.error("CANCELING I2CP LISTEN", new Exception("I2CP Listen cancelled!!!"));
         _running = false;
     }
     
+    /** 
+     *  Just so unit tests don't NPE, where router could be null.
+     *  @since 0.9.20
+     */
+    private boolean isAlive() {
+        Router r = _context.router();
+        return r == null || r.isAlive();
+    }	
+
     /** give the i2cp client 5 seconds to show that they're really i2cp clients */
     protected final static int CONNECT_TIMEOUT = 5*1000;
     private final static int LOOP_DELAY = 250;